单项选择题

A guided missile consists basically of a warhead attached to a tube like body. A rocket or a jet engine may ______ the missile.

A．power
B．pull
C．compel
D．expel
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单项选择题
They ______ those who didn't conform to their ideas, and made advantage of those who agreed with them.
A．explored
B．persecuted
C．extended
D．pinched
单项选择题
Among the deaf and dumb ______ may be carried on by means of the finger alphabet.
A．communication
B．calculation
C．transportation
D．vision
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